Yesterday, Susan Sarandon went on Chris Hayes’s show on MSNBCto talk about, among other things, Bernie Sanders and her support for him. Here’s what happened when he asked her if she would vote for Hillary Clinton, if Clinton won the primaries:

Sarandon: I don’t know. I’m going to see what happens.Hayes: Really?Sarandon: Really.
[…]Sarandon: Some people feel that Donald Trump will bring the revolution immediately if he gets in, things will really explode.”

Debra Messing, best known for starring in “Will & Grace,” and of course, a member of the tribe, watched the interview and disagreed vehemently. So, as many celebs do nowadays, she took her feelings to Twitter.

This is how she started:

Susan Sarandon muses tht Trump prezcy wud b better 4 the country thn Hillary.Wonder if she’d say that if she were poor,gay,Muslim or immgrnt— Debra Messing (@DebraMessing) March 30, 2016

For non-twitter users: “Susan Sarandon muses that Trump presidency would be better for the country than Hillary. Wonder if she’d say that if she were poor, gay, Muslim or immigrant.”

This is y Bernie beats Trump by wider margin in polls & y independent voter support 4 HC can’t be taken for granted. https://t.co/ZT7xKOeC6a— Susan Sarandon (@SusanSarandon) March 30, 2016

Despite attacks from Bernie Bros and others, Messing stood her ground, sharpening her arguments with 125 character tweets and retweets. She responded to her detractors, proving that sometimes refusing to back down is more important than not feeding the trolls:

Messing’s point remained. She had no intention of swaying voters to vote for her candidate (Messing is a Hillary supporter), she didn’t in any way want to ignore the importance of independent voters, or to deny the fact that it might be easier to sway a certain type of Republican voter to vote for Bernie (these were all points her detractors tweeted at her).

What she wanted from Bernie supporters, including high profile ones like Sarandon herself, is to say that if (if!) Hillary wins the nomination, they will do everything they can to stop Trump from getting in the White House. And that means voting for her in the General Election. A hypothetical concession that a significant number of Bernie supporters(33% of them, according to a Wall Street Journal poll) claim they’re not willing to make.

For Sarandon, a former fervent Nader supporter, that concession may not be in the cards. She might, like the Bernie Or Bust movement, put in a blank ballot or refuse to participate at all. But for Messing and many Democrats, for who the stakes are so high, that feels stupid and selfish.